I can give you half an answer, this is what the FAQ's still say:
If there is a service issue can the service charges be adjusted on board?
Guest satisfaction is the highest priority at Norwegian Cruise Line. We have structured a guest satisfaction program designed to handle any concerns about service or on-board product quickly and efficiently. However, in the event a service issue should arise during your cruise please let our on-board guest services desk staff know right away, so that we can address these in a timely manner. It is our goal to reach a satisfactory solution to any issue when it happens and make sure our guests can focus on enjoying their cruise. Should your concerns not be met with satisfaction you can adjust the charges.